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tips, technology, tools and techniques related to vehicle driveline components

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roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Machining an sbf raw forged crank
Posted by: roverman
Date: July 02, 2014 11:41AM

Anybody done this ? I have a good sized cnc lathe, but no live tooling, or tooling for crankshaft machining. I have a raw forging coming, of which I hope to machine for RV8/sbb. I plan to make 1.70" off-set fixturing, for 3.4" stroke. I'll like start at #3 main, for linear start dimension, to better accomodate the longer ford dimensions. Onward, roverman.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Machining an sbf raw forged crank
Posted by: BlownMGB-V8
Date: July 02, 2014 10:12PM

You going to rough turn it and then have it ground and polished?

Jim


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Machining an sbf raw forged crank
Posted by: roverman
Date: July 03, 2014 01:44PM

Yep, is the plan. Maybe have the rod journals rough/finish ground. They are already roughed for sbf, so "might" require welding, to make the RV8 off-sets. Onward, roverman.


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Machining an sbf raw forged crank
Posted by: roverman
Date: July 07, 2014 12:05PM

Any skilled 4340 welders ? I've been quoted $100/journal, x (9), to submersed arc weld this crank. Not a viable option. How about argon flood tig ? What rod for 4340 ? Plan is to anneal,machine and nitide. Thanks, roverman.


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Machining an sbf raw forged crank
Posted by: roverman
Date: July 15, 2014 11:02AM

It's here ! It's massive ! Must weigh 70+ lbs. Ford Windsor SVO,(Ford made). Capable of 4.1" stroke, a bit much for a RV8 ? More likely to be 3.4"= 302". Very small chance of finding 5L "vintage" anything class ? Onward, roverman.


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Machining an sbf raw forged crank
Posted by: roverman
Date: July 15, 2014 08:27PM

Viola ! I've started making chips, kinda fun. Made quick/dirty V blocks, to mount crank on verticle mill. Faced snout end and center drilled, with 90 deg. spindle attachment,(very handy) ! Lathe is next. Onward, roverman.


MGBV8
Carl Floyd
Kingsport, TN
(4511 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Machining an sbf raw forged crank
Posted by: MGBV8
Date: August 01, 2014 11:50AM

You need one of these, Art. ;)

[www.youtube.com]



DiDueColpi
Fred Key
West coast - Canada
(1365 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: Machining an sbf raw forged crank
Posted by: DiDueColpi
Date: August 01, 2014 01:07PM

Holy crap Carl!!
What a machine.
The control that it exhibits is phenomenal.
Do you think that crank is just a demo or does it actually fit something?

Cheers
Fred


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Machining an sbf raw forged crank
Posted by: BlownMGB-V8
Date: August 01, 2014 05:16PM

Yes, well, just imagine the amount of programming that took. I'll guarantee you the crank is a mass production part. There's no way anyone would go to that much effort just for a demo.

Jim


MGBV8
Carl Floyd
Kingsport, TN
(4511 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Machining an sbf raw forged crank
Posted by: MGBV8
Date: August 01, 2014 05:17PM

Don't know, Fred. Found it on a motorcycle forum. Pretty amazing.

MARTECH Machinery & Automation

[www.martechcnc.com]



Edited 1 time(s). Last edit at 08/01/2014 05:33PM by MGBV8.


phongshader
Justin Brown
Ca
(63 posts)

Registered:
02/19/2010 04:03PM

Main British Car:
Locost Lotus 7 2.3 Duratec

authors avatar
Re: Machining an sbf raw forged crank
Posted by: phongshader
Date: December 24, 2014 01:10PM

any news or progress on the crank?


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Machining an sbf raw forged crank
Posted by: roverman
Date: December 24, 2014 06:37PM

Alas, domicile outranks crank style. My current project is converting a modular classroom, to a residence. Seems like I never do nuthin-nice an easy. Cheers, roverman gone modular.


tbo
Tim Body
St Thomas Ontario
(221 posts)

Registered:
01/27/2013 06:47PM

Main British Car:
1954 Triumph TR2 stock 2 litre

Re: Machining an sbf raw forged crank
Posted by: tbo
Date: December 27, 2014 08:39PM

Wow. That was amazing . Wish my Dad was still around to see that.He had a machine shop with a big lathe about six feet long and a Model A three speed transmission mounted on it. When he went from first second to third gear cut metal used to fly off that thing in big long curlyques like it was going out of style!Still makes me smile just to think about it


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